Electromagnetic core



Jan. 9, 1923. 1,441,522

H. R. PATTERSOJ. ELEcTRoMAGNETI c ons.

FILED JUNE 25, 1917. 2 SHEETS-SHEET 1 I YI 1111111 r1 llllll Il f m1- m- @Hof/n m 2 SHEETS-SHEET 2 Jan. 9, 1923.

H. R. PATTERSON.

ELEcTRoMAGNETIc CORE.

F1 LED JUNE 25 1917 ijmw/noz Har/y A. Paire/*san @Hoang Patented Jan. 9,

UNITED sTATEs PATENT OFFICE.

HARRY B. PATTERSON, F TOLEDO, OHIO, ASSIGNOB TO ELECTRIC AUTO-'LITE CORPO- (RA'LION, OF TOLEDO, OHIO, A CORPORATION OF DELAWARE.

ELECTBOIAGNETIC CORE.

applieanon mea :ne 25, 1917. serial m. 176,795.

To all whom it may'ooncem I Be it known that I, HARRY R. "PATTERSON,

' a citizen of the United States, residing at with my invention.

Toledo, inv'the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Electromagnetic Cores, of vwhich I declare the following to be a full, clear., and exact description.A I y This invention relates to improvements in cores for electro-magneticmachines, such as induction coils, transformers, dynamo-electric machines and similar devices.

The principal object of this invention is to provide a simple and ,effective core employing a coiled strip of metal. A further object is to provide an improved core con-- construction, in which the effective volume of a solid metal core will be approximated, with a marked reduction in the corresponding heat losses due to eddy currents. Still a further objectvof my invention is to provide a. core structure, which maybe manufactured and assembled with great facility and economy. Y

Further objects, and objects relating to 'details of manufacture and economies of construction,` will deiinitely appean from the detailed description to follow.

I accomplish theA objects of my invention by the devicesv and means described in theV following specification.

A structure constituting a preferred embodiment of my invention is illustrated in the accompanying drawings, forming a part of this specifcat1on, in which-4 l F igure-I is a view, in side elevation, of a core constructed in accordance with my invention, a -part of the side being broken away to show the core construction;

Figure II is an enlarged, sectional view, taken substantially on the line -II-II of Figure I; Y Y K Figure III is an enlarged, transverse, sectionalview, showing one manner in which a number of cores constructed in accordance A.

with my invention can be grouped vtogether Figure IV is a sectional view, similarto Figure III, showmgi another grouping 'of a number of cores constructed 1n accordance Fi re V is a sectional view, showing one method .by which a -pair of cores constructed in actual use.

in accordance with my invention may be connected together. e Y

Figure `V I is a view, in side elevation, ofa construction suitable for transformers.

F igure VII is a plan view 'of a portion of the metal strip used in forming the core.

Fi ure VIII is an enlarged, detail, sectlona view taken on the lineVIII-VIII of F ig.'V VII.

Figure IX is a view, similar to Figure VIII, but showing an insulating fabric ap.- plied to the surface of the blank.

l -F1gure X is a view showing the application of a core constructed in yaccordance with my invention to a rotating armature. l

.Figure XI is a similar view showing field poles embodying my core. V

Figure XII is a view showing tion embodied in a transformer.

In the drawings, similar reference numerals refer to Similar parts vthroughout the my invenseveral views, and the sectional views aremit. In order to accomplish this end, the

strip is preferably coiled upon itself, as shown in Figures I and II. In order to insulate the contiguous surfaces of the'adjacent convolutions of the coiled strip, I Y preferably shellac the same, as shown in Figure VIII, before ceiling the strip, although I may depend for my insulation upon the oxidizedfsurfaces of the strip. In the modifcation, shown in Figure IX, I provide a layerof insulating fabric 4 on the strip, which,

when the strlp is wound into a coil, Serves to insulate the contiguous surfaces of the adjacent :'convolutions of the coil from each other. YThe core comprised bv this .coiled metal strip is preferably mounted in an in-.

sulatingtube 5, but this is not at all essential. Itfwill be apparent from the above dei s'cription that the magnetic conductivity of the core'is not affectedlongitu'dinally, and

that, at the same time. by virtue of the 1material density of the core is as great as possible under the'circumstances, it will be apparent that the magnetic intensity per unit of volume approaches that of a solid magnetic core, While, at the same time, the

heat losses due to eddy currents are cut down to a. minimum, because the development of such eddycurrents is prevented vby the interposition of the insulatingsurfaresV between the convolutions of the coil.

In Figure II, I have illustrated the means of attachment of a core to a rod 6. The inner end 7 of Vthe coil is benttoward the center thereof, and inserted in aslot 8 formed in the rod thereby preventing relative motion of the rod and coil. This figure also illustrates the method of attachment of the strip to a rod for the purpose of winding the strip-in the coil form. The slot in that ease extends completely to the end of the rod, so that the completed coil core may be readily removed from the rod.

In Figure III, I show a core formed of a Series of coils, arranged parallel to each other, and grouped within an insulating` tube 5.

In Figure IV, I have shown a series-of coils, grouped around a solid central cor'e', which may be formed of 'a material having a different permeability from that of the coils, as would be the case Where a series of groups of coils are mounted on a central rotating shaft.

In Figure V, I have shown my invention applied to the armature of a rotating electro-magnetic machine. The separate coils are independently wound and inserted upon the framework 10 of a rotatable drum or ring.A

In Figure VI, I s how my invention utilized to provide cores for transforming apparatus.-

In Figure X, I

show a rotating armature comprising a central frame 11 carryandhaving a Winding 17 forming part oa primary circuit, the secondary. or induced circuit being shown at 18.

Other modilications and uses of my invention will be apparent to those skilled in the art to which it relates, and I wish, therefore, to claim my invention broadly as well as specifically, as will be evident -from the appended claims.

Having thus described my invention, what' I claim as new and desire to" secure by Letters Iatent is:

1. A core for an electro-magnetic apparatus, comprising a spirally coiled Strip of magnetic material, the adjacent convolutions of said spiral being separated by insulating material, and a rod on which said strip is rigidly wound, said rod ter- Aminating between the ends of said core.

2; In acore construction for an electromagnet, a rod having a slot forniedtherein, a sheet of metallic material extending into said Slot and rigidly wound on said rod `in spiral form, and insulating material interposed between the adjacent convolutions of' said spiral.

3. A core Structure comprising a Solid supporting rod, a plurality of independent spirally wound strips of relatively high permeability surrounding said rod and an enclosing casing forAsaid rod and spirally Wound strips.

' 4. A. core for an electro-magnetic apparatus, comprising arod, and a series of spirally wound Aindependently coiled strips of magnetic metal disposed about the rod with their centers in spaced relation.

In testimony whereof I ailix my signature.

HARRY It. PATTERSON. 

